Ligma means: A notional disease mentioned to trick the interlocutor into inquiring as to its nature, whereupon the speaker responds by saying ligma balls (lick my balls) as a prank.. It is internet-era slang, commonly seen on TikTok, Discord, Reddit or X. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.